Open 'C:AnachronoxanoxdataCONFIGS' and look around the files. You can open any of them as a txt file (make a backup first!). Specifically, the developer file - devl.cfg. You'll notice that here, and all the other files, there are command lines like. Type in the following command (it doesn't matter where, but the file was organized when it was made):

bind u "invoke 1:86"

This will start function "invoke 1:86," the in-game cheat menu, whenever the 'u' key is pressed. You can cut and paste other lines. They should be self-explainatory about what they do. Then use your discretion to change what keystroke it's bound to and what it does.